well, yeah. In most cases, its piracy
No. There's a huge difference between enabling, supporting and promoting piracy. Enabling piracy (which is usually as far as emulators go down the piracy spectrum) is something that most things are obviously guilty of. Even basic verbal communication allows us to infringe on copyrights and intellectual property, as do a pair of hands and an internet connection. The ultimate responsibility to do the right thing in all these cases is yours.
What you personally do on your end with an emulator has NOTHING to do with the policies and goals of the developers of that emulator, something that they sometimes even explicitly mention in their terms of use document, in case someone who, like yourself, is unable to comprehend their own responsibilities and rights and comes along.
You also seem to fail to understand the difference between illicitly using software that you have not paid for and using an emulator. I guess mp3 automatically means copyright protected music and .avi files are only illegal divx rips as well in your fantasy universe.